/Engine/Plugins/Runtime/ReplicationGraph/Source/Public/ReplicationGraph.h
When the GridBounds is set we limit the creation of cells to be exclusively inside the passed region. Viewers who gather nodes outside this region will be clamped to the closest cell inside the box. Actors whose location is outside the box will be clamped to the closest cell inside the box.
void SetBiasAndGridBounds ( const FBox & GridBox )